<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>常用标签</title>
</head>
<hr>
   <!-- h1 ... h6  -->
  <h1>标题1</h1>
  <h2>标题2</h2>
  <h3>标题3</h3>
  <!-- 
    <h8>标题8</h8>
    标题8 
  -->
  <p>
    段落1
    段落2
    段落3
    段落4
  </p>
  <hr>
  <p>
    段落1
    段落2
    段落3
    段落4
  </p>
  <hr>
  aaa <br>
  bbb <br>
  ccc <br>
</body>
</html>